TC Oil Seal – Double Lipped Rotary Shaft Seal | Silicone Dust Seal

Measure three dimensions on your application: the shaft outer diameter (this becomes the seal's ID), the housing bore inner diameter (this becomes the seal's OD), and the housing depth (this becomes the seal's width). TC oil seals are typically labeled ID × OD × Width in millimeters — for example, 20 × 40 × 7 mm (≈0.79" × 1.57" × 0.28"). Always measure in millimeters for accuracy and cross-reference with your equipment service manual when available.

The TC double lip design adds a secondary dust exclusion lip behind the primary oil-retention lip. The primary lip retains lubricant inside the housing; the secondary lip blocks dirt, dust, and moisture from entering from the outside. In most cases, this dual-barrier construction outperforms single-lip seals in environments with airborne debris, mud, or water splash.

Silicone (VMQ) TC oil seals typically withstand continuous operating temperatures from approximately −65°F to +400°F (−54°C to +204°C). This range generally covers automotive engines, gearboxes, and outdoor power equipment. For applications with sustained temperatures above this range, contact us to confirm suitability before ordering.

Yes. Silicone is inherently resistant to moisture, ozone, and UV exposure. TC oil seals with a double lip are generally well-suited for outdoor power equipment, agricultural machinery, and marine auxiliary applications where water ingress and airborne debris are ongoing concerns. The secondary dust lip provides an additional barrier against water splash.

These TC oil seals follow metric dimensional standards (ISO 6194 / DIN 3760) and are designed for metric rotary shafts. They are commonly used with shaft diameters ranging from approximately 6 mm to 200 mm. If your equipment uses inch-standard shafts, verify that the exact OD and ID dimensions in millimeters match your housing bore before ordering — the physical dimensions are what matter, not the nominal designation.

Clean the housing bore and shaft thoroughly before installation. Lightly lubricate the seal lip with the fluid it will be retaining. Press the seal in squarely using a seal driver or a flat wooden block — never strike the seal face directly with a hammer. The seal should sit flush or slightly below the housing surface. If the shaft has a sharp edge or keyway, use a chamfer or a thin installation sleeve to protect the lip during assembly.

Silicone seals are generally compatible with petroleum-based engine oils, gear oils, automatic transmission fluid (ATF), water, and many synthetic lubricants. They are not recommended for use with concentrated DOT 3/4 brake fluid or ketone-based solvents. If your application uses an unusual or aggressive fluid, contact us to confirm compatibility before ordering.

TC (double lip) seals are the most common choice for rotating shaft applications where both oil retention and dust exclusion are needed. If your application only requires oil retention with no external contamination risk, a single-lip (SC or SB type) seal may suffice. If you are unsure which type your equipment originally used, check the service manual or contact us with your equipment make, model, and shaft dimensions.